/Engine/Source/Editor/UnrealEd/Public/WorkflowOrientedApp/WorkflowUObjectDocuments.h
Helper method to get the payload object as a specific type (checks both that the payload is aFTabPayload_UObject, and that the type is correct)
template<typename CastType> static CastType * CastChecked ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FTabPayload](API\Editor\UnrealEd\WorkflowOrientedApp\FTabPayload) > Payload )